![]() A megohmmeter usually is equipped with three terminals. Third, a megohmmeter has a relatively high internal resistance, making the instrument less hazardous to use in spite of the higher voltages. ![]() Second, the range of a megohmmeter is in megohms, as its name implies, instead of ohms as in a multimeter. Higher voltages are used to stress insulation to a greater degree and thus obtain more accurate results. The most common voltages are 500V and 1,000V. There are differences, however.įirst, the megohmmeter's output is much higher than that of a multimeter. The megohmmeter is similar to a multimeter when the latter is in its ohmmeter function. The megohmmeter. A basic megohmmeter hook-up schematic is shown in Fig. To help eliminate this lack of understanding, let's discuss in detail Insulation Resistance (IR) testing and the megohmmeter. One of the simplest tests and its required test instrument is not universally understood. As such, it's important to identify this deterioration quickly so that corrective steps can be taken. This deterioration can result in dangerous conditions in power reliability and personnel safety. Any harsh installation environments, especially those with temperature extremes and/or chemical contamination, accelerate this process. As it ages, its insulating performance deteriorates. Insulation starts to age as soon as it's made. ![]() If you’d like to see updated information on this topic, please check out this more recently published article, Insulation Resistance Testing Simplified. Thank you for visiting one of our most popular classic articles.
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